Elephants are in immediate danger. They must drink almost daily. 大象的生命变得岌岌可危 因为它们几乎每天都要喝水

222. grazers are marching in search of grass and water.
     食草动物正浩浩荡荡地行进着 去寻找草和水
223. Without rain, these plains can become dust bowls.
     由于缺乏雨水 这里的草原变成了黄尘地带
224. Grass can now lose its hold.
     草现在也许会被连根拔起
225. Elephants are in immediate danger. They must drink almost daily.
     大象的生命变得岌岌可危 因为它们几乎每天都要喝水
226. Driven on by thirst,
     在干渴的驱使下
227. they march hundreds of miles across the parched plains.
     它们在干涸的平原上跋涉几百英里
228. Relying on memory, the matriarchs lead their families to those special water holes that saved them in previous years.
     领头的老雌象 凭着记忆 带领全家大小去寻找以前救过它们的水坑

来自《行星地球 第一季 第七集 Planet Earth S01E07 伟大草原》第 225 行